The image shows the similarities in the HOX developmental genes and their expression in C. elegans worms, D. melanogaster fruit flies, B. floridae, M. musculus mice, and humans.

Hox protein classification across model organisms by Stefanie D. Hueber et al, CC by 4.0 via Wikimedia

A set of genes known as Hox genes are in charge of the segmented development of the body. Parts of the Hox genes are directly related to different segments of the body. Hox genes are very similar between almost all eukaryotic multicellular organisms. What is the most likely reason for this?

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